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Site Background Information: Thater Property (former Tucker Construction) <br /> Page 2 of 4 <br /> is used for domestic, industrial, and commercial purposes. <br /> STRATIGRAPHY <br /> In general, silty sand and sandy silt have been encountered in at 5 feet bsg, with fine- to coarse- <br /> grained sand identified at 10 feet in borings BI and B3,and at 10 feet and 15 feet in boring B2.Silty <br /> sand and sandy silt were encountered in borings B 1 and B3 at 15 feet bsg. Sand was encountered <br /> in all three borings at 20 feet bsg. Clayey material(silty clay, clayey silt, and some sandy clay and <br /> clayey sand) was encountered in borings BI, B2, and B3 at 25 feet bsg and also at 30 feet bsg in <br /> boring B2.Fine-grained sand was identified in B I and B2 at 30 feet and 35 feet bsg,with silty sand <br /> and sandy silt encountered to the total depth of all three borings (55 feet bsg). <br /> UNDERGROUND STORAGE TANK REMOVAL <br /> Based on conversations conducted by J.H. Kleinfelder & Associates (JHK) with former property <br /> owner Tom Tucker and San Joaquin County Environmental Health Department(EHD)personnel, <br /> two 1,000-gallon USTs were removed from the site in 1984 or 1985. No further information <br /> regarding the excavation and removal of the USTs is available to Advanced GeoEnvironmental,Inc. <br /> (AGE) at this time. <br /> SITE ASSESSMENT ACTIVITIES <br /> • On 16 October 1985, JHK advanced one soil boring to a depth of 65 feet bsg for the <br /> installation of one ground water monitoring well (MW-1). The well was constructed of <br /> 2-inch diameter polyvinylchloride (PVC) casing with a 0.020-inch slotted screen installed <br /> from 35 feet to 65 feet bsg.Number 2 Monterey sand was installed to approximately 1 foot <br /> above the screened interval, with a bentonite seal above the sandpack. Soil samples were <br /> collected at 5-foot intervals from 10 feet to 45 feet bsg and transported under chain of <br /> custody to California Water Labs (CWL); only soil samples taken at 35 feet (BI-35) and <br /> 40 feet bsg (B 1-40) were analyzed. Total petroleum hydrocarbons (TPH) was detected in <br /> samples BI-35 and B1-40 at concentrations of 68 milligrams per kilogram (mg/kg) and <br /> 193 mg/kg, respectively; benzene was detected in the samples at concentrations of <br /> 0.0133 mg/kg and 0.296 mg/kg, respectively; xylenes were detected in the samples at <br /> concentrations of 0.282 mg/kg and 27 mg/kg,respectively. Toluene was detected in sample <br /> B1-35 at a concentration of 0.12 mg/kg and ethylbenzene was detected in sample B1-40 at <br /> a concentration of 6.9 mg/kg. <br /> • On 19 October 1985,monitoring well MW-I was developed and ground water samples were <br /> collected and transported to CWL for analysis.BTEX(benzene,toluene,ethylbenzene,and <br /> total xylenes)compounds were detected at concentrations of 21.2 micrograms per liter(µg/1) <br /> benzene, 204 µg/I toluene, 12.4 µg/1 ethylbenzene, and 1,440 µg/1 total xylenes. TPH was <br /> Advanced GeoEnvironmen[al,Inc. <br />